<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
{% for classify in classifys %}
    <p>{{ classify.c_name }}</p>
    {% for article  in classify.art_list%}
        <p>{{ article.a_name }}</p>
    {% endfor %}
{% endfor %}
</body>
</html>